Cadmium and Cooper Removal from Aqueous Solution by Adsorption onto Treated Fly Ash Collected From CET-Brasov

Abstract

The adsorption can perform many separations that are impossible or impractical by conventional techniques such as distillation, absorption, and even membrane-based systems. The use of fly ash (FA) in wastewater treatment received a lot of attention for the immobilization of heavy metal cations, mainly Cd²⁺, Pb₂₊, Ni₂₊, Zn₂₊, and Cu₂₊, and in the dye finishing industry. Modifying the fly ash surface can be a solution for reaching both goals. The paper presents the results obtained in the adsorption of cadmium and copper ions on FA powders washed with methylene blue and NaOH 2N solutions. The AFM images proved that the initial surface morphology plays an important role in these processes.